Near a half a mile off of route 74 is the Knowlton Brook campsite. it is unremarkable in amenities but packed full of atmosphere! the fire ring is roughly 10′ away from the brook itself and there is room for a couple smaller tents.
The brook should provide year round water and during the summer the swampy areas surrounding it should dry up some. I would still recommend bug spray and boiling/filtering your water.
Bring your poles, there are native trout in that brook!